Boat anchor



FIG. 1 is a perspective view of a boat anchor showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a left end view thereof;

FIG. 5 is a right end view thereof;

FIG. 6 is a bottom plan view thereof; and

FIG. 7 is an enlarged fragmentary top view thereof, showing the shank of the boat anchor. 

The ornamental design for a boat anchor, substantially as shown and described. 